treewide: remove the-kenny from maintainers

@the-kenny did a good job in the past and is set as maintainer in many package,
however since 2017-2018 he stopped contributing. To create less confusion
in pull requests when people try to request his feedback, I removed him as
maintainer from all packages.

pkgs/development/interpreters/elixir/generic-builder.nix

@@ -73,6 +73,6 @@ in
 
       license = licenses.epl10;
       platforms = platforms.unix;
-      maintainers = with maintainers; [ the-kenny havvy couchemar ankhers filalex77 ];
+      maintainers = with maintainers; [ havvy couchemar ankhers filalex77 ];
     };
   })